OBD-II Code P0443 — What It Means & How to Fix It

What Does This Error Mean?

P0443 means there's an electrical problem with the EVAP system's purge control valve. The purge valve controls when fuel vapors from the gas tank are sent to the engine to be burned. When the valve's circuit fails, fuel vapors may not be purged properly. You probably won't notice any driving symptoms, but you may smell gasoline fumes. The check engine light will stay on and you'll fail an emissions test.

Affected Models

All vehicles 1996+
Common in Toyota Corolla
Common in Honda Civic
Common in Chevrolet Cruze
Common in Ford Fusion

Common Causes

Failed purge control valve solenoid that is stuck open or closed
Corroded or damaged wiring in the purge valve circuit
Blown fuse supplying power to the purge valve
Bad electrical connector at the purge valve with loose or corroded pins
Failed engine control module not sending the proper command signal

How to Fix It

Locate the EVAP purge control valve. It's usually found on or near the intake manifold, connected to vacuum hoses and an electrical connector. It's a small solenoid valve about the size of a soda can.

Search your vehicle's year, make, and model plus 'purge valve location' for the exact spot.
Check the electrical connector at the purge valve. Unplug it and inspect for corroded, bent, or loose pins. Clean the contacts with electrical contact cleaner and reconnect securely.

A loose connector can cause intermittent P0443 codes that come and go.
Check the fuse for the EVAP system. Look up the fuse location in your owner's manual. Replace it if blown, but investigate why it blew before just putting in a new one.

If the fuse is good, the problem is most likely the valve itself or its wiring.
Replace the purge control valve if the connector and fuse are fine. These valves fail over time and are one of the most common EVAP system repairs.

Purge valves cost $15-$50 at auto parts stores. They usually just plug in and bolt on with no special tools.
Clear the code and drive for several days. The EVAP system monitor needs specific driving conditions to run its self-test and confirm the repair.

EVAP monitors often need a cold start followed by highway driving, then city driving. It can take a few days.

When to Call a Professional

If replacing the purge valve and checking wiring doesn't fix the code, see a mechanic. The issue could be in the wiring harness or the engine computer. A technician can test the circuit with a multimeter and verify the ECM output. Expect to pay $80-$150 for diagnosis. Purge valve replacement at a shop is typically $100-$250 with labor.

Frequently Asked Questions

What does the EVAP purge valve do?

It controls when fuel vapors are sent from the charcoal canister to the engine. Gasoline naturally produces vapors inside the fuel tank. Instead of releasing these vapors into the air, they're stored in a charcoal canister. The purge valve opens at the right time to route those vapors into the engine. The engine then burns them as part of the normal fuel mixture.

Can I smell gasoline because of P0443?

Possibly, yes. If the purge valve is stuck open, excess vapors can flood the intake. If it's stuck closed, vapors may build up and find other escape routes. A gasoline smell near the engine bay or exhaust is a clue. However, fuel smells can also come from other sources, so don't assume P0443 is always the cause.

Is P0443 the same as P0440 or P0455?

They're related but different. P0443 is specifically about the purge valve's electrical circuit. P0440 is a general EVAP system malfunction — could be many things. P0455 is a large EVAP system leak, often from a loose gas cap. All three relate to the same emissions system but point to different problems.